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Mathematics 9 Online
OpenStudy (anonymous):

A plane is passed parallel to the base and 8 cm. from the vertex of a pyramid whose base is 45 sq cm. and whose altitude is 12 cm. what is the volume of the part of the pyramid that remained after the top had been removed?

OpenStudy (anonymous):

@ganeshie8

OpenStudy (anonymous):

@dan815

OpenStudy (anonymous):

@mathstudent55

OpenStudy (anonymous):

@aajugdar

OpenStudy (dan815):

|dw:1401271724515:dw|

OpenStudy (anonymous):

yes

OpenStudy (dan815):

volume of pyramid formula

OpenStudy (anonymous):

OpenStudy (anonymous):

but its a frustum question

OpenStudy (dan815):

whats that

OpenStudy (anonymous):

Frustum of a pyramid

OpenStudy (dan815):

ok

OpenStudy (dan815):

so find the volume of the pyrmid above the 2nd plane and subtract it from the total volume

OpenStudy (anonymous):

\[V=1/3(b+B+\sqrt{bB}b\]

OpenStudy (dan815):

|dw:1401272179437:dw|

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